8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Heat of Vaporization 4 questions
Heat of Vaporization
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
Use q = mHv for vaporization at the boiling point. For water in this worksheet, Hv = 2,260 J/g and liquid water’s specific heat is 4.18 J/(g·°C).
Question 1
How much heat vaporizes 2.00 g of water at its boiling point?
- 1,130 J
- 2,260 J
- 4,520 J
- 9,040 J
Question 2
A water sample absorbs 11,300 J as it vaporizes at its boiling point. Calculate the vaporized mass.
Write your answer and work on the printable worksheet, or answer online.
Question 3
Which process releases heat from a water sample at its boiling point?
- Vaporization of liquid water
- Condensation of water vapor
- Warming of liquid water
- Melting of ice
Question 4
Explain what the added heat does while a pure liquid is boiling at fixed pressure and constant temperature.
Write your answer and work on the printable worksheet, or answer online.
Heating Samples at 1 atm 4 questions
Heating Samples at 1 atm
Use the information below to answer the questions.
Each run uses 10.0 g of water at 1 atm, with negligible energy loss. The boiling point is 100.0 °C. Use Hv = 2,260 J/g and a liquid specific heat of 4.18 J/(g·°C).
| Run | Initial temperature (°C) | Energy supplied (J) |
|---|---|---|
| P | 100.0 | 11,300 |
| Q | 100.0 | 22,600 |
| R | 90.0 | 418 |
Question 5
Which run receives just enough energy to vaporize all 10.0 g?
- P
- Q
- R
- All three
Question 6
How much water vaporizes in run P? Show how you use the heat of vaporization.
Write your answer and work on the printable worksheet, or answer online.
Question 7
Use the supplied energy to explain why run R can reach 100 °C but has no energy left for vaporization.
Write your answer and work on the printable worksheet, or answer online.
Question 8
If the 5.00 g of vapor from P condenses at the boiling point, how much heat does it release?
- 2,260 J
- 4,520 J
- 11,300 J
- 22,600 J
2025 Chemistry Reference Tables · Browse Chemistry worksheets